the big news is general david petraeus on monday will leave afghanistan as commander of the war and be replaced by marine general john allen. petraeus will retire from the army after decades of service, come back to washington and head the central intelligence agency. >> i'm paul steinhauser. tomorrow tim pawlenty begins a swing through iowa doing well in the state that holds the first contest in the race for the white house is crucial to winning the nomination. wednesday, what's billed as the first ever twitter presidential debate. six candidates say they will take part in the event put on by an on drt -- online tea party group. >> i'm poppy harlow in new york. a watch dog association in washington opens its doors on thursday. the consumer financial protection bureau inspects the books of the biggest banks to ensure they are abiding by credit card laws and respond to consumer complaints. the white house has yet to appoint a director due to opposition in congress. we'll get key reports on the housing market and also earnings from g.e., coca-cola, wells fargo and caterpillar. we track i